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US 2026/0173770 A1Published application
Selectable tunnel junctions based on in-line measured resistance
AssigneeInternational Business Machines Corporation
InventorsJeffrey W. Sleight, Isaac Lauer, Karthik Balakrishnan, David James Frank
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Abstract
A qubit structure includes a substrate; a first planar metal portion residing on the substrate; a second planar metal portion residing on the substrate; a plurality of candidate tunnel junctions, a first end of each candidate tunnel junction coupled to the first planar metal portion; and a plurality of pads, each pad coupled to a second end of each candidate tunnel junction.
Claims20
A qubit structure comprising:
- a substrate;
- a first planar metal portion residing on the substrate;
- a second planar metal portion residing on the substrate;
- a plurality of candidate tunnel junctions, a first end of each candidate tunnel junction coupled to the first planar metal portion;
- and
- a plurality of pads, each pad coupled to a second end of each candidate tunnel junction.
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A method comprising:
- measuring a resistance between a first planar metal portion and each of a plurality of pads, the first planar metal portion being coupled to one end of each of a plurality of tunnel junctions and each of the plurality of pads being coupled to a corresponding one of the plurality of tunnel junctions;
- selecting an optimal tunnel junction of the plurality of tunnel junctions, the optimal tunnel junction having a measured resistance closest to a target resistance;
- and
- coupling the pad corresponding to the selected tunnel junction to the second planar metal portion with a connector.
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A cryogenic system comprising:
- a cryostat configured to cool to cryogenic temperatures;
- a qubit structure residing in the cryostat, the qubit structure further comprising:
- a substrate;
- a first planar metal portion residing on the substrate;
- a second planar metal portion residing on the substrate;
- a plurality of candidate tunnel junctions, a first end of each candidate tunnel junction coupled to the first planar metal portion;
- and
- a plurality of pads, each pad coupled to a second end of each candidate tunnel junction.
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Dependencies are inferred from the claim text.